Pur hot melt adhesive
is one of the types of polyurethane hot melt adhesive.
Distinguish, according to the chemical properties of polyurethane hot melt adhesive has two types, one kind is thermoplastic polyurethane hot melt adhesive, another kind is reactive polyurethane hot melt adhesive.
We usually use of reactive polyurethane hot melt adhesive, its solidification principle is based on the NCO base prepolymer base makings, deserve to not reaction with isocyanate thermoplastic resin, viscosity resin, antioxidants, catalyst, additive such as filler.
PUR glue heating molten fluid, coated in glued base material surface, will be glued laminating, two bonding is formed after cooling, after the use of moisture in the air or glued trace moisture of base material and other active hydrogen compounds react with NCO groups, chain extender, clinch a deal the polymer network structure and has high cohesion, stick relay further strengthen, once cured, it shows special waterproof, high resistance to chemical corrosion resistance and weatherability.
Factors influencing the early pur hot melt adhesive curing time have the following: a, environment humidity, pur regularly moisture curing, hot melt adhesive is in the air environment humidity is big, short curing time, on the other hand, the time is long.
Second, the environment temperature PUR hot melt adhesive of environmental temperature is high, is advantageous to the water to participate in the reaction, curing time will be shortened accordingly.
Third, sizing of PUR sub gelatinizing amount, will affect the curing time, if the rubber thin coating, the curing time is short.
Glue quantity more occasions, as curing glue can appear the amount of water is relatively inadequate, curing time will be longer.
Four, glue itself glue formula itself is not the same, curing time is not the same.
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